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Table 3 Total number of differential tables per pair
Emulation type
Equation
OPEN-3
OPEN-8
OPEN-9
OPEN-E
OPEN-L
Total number of differential tables per pair = [(X ÷ 48) + (Y x 15)] ÷ Z
• (X): Volume capacity (KB)
1, 2
• (Y): Number of control cylinders associated with the emulation type (see Table 4)
• (Z): Number of slots that can be managed by a differential table (61,312)
NOTE:
Roundtheresultofthecalculationuptothenearestwholenumber.
For example, if the volume's emulation type is OPEN-3, and it is not a custom volume,
the volume capacity (X) is the default volume size, 2,403,360 KB, and total number of
differential tables is calculated as follows:
[(2,403,360÷48)+(8x15)]÷61,312=0.81860
Whenyouroundtothenearestwholenumber,theresultis1.Therefore,thetotal
number of differential tables for a pair is 1 when the emulation type is OPEN-3.
OPEN-V
Totalnumberofdifferentialtablesperpair=(X÷256)÷(Z)
• (X): Volume capacity (KB)
2
• (Z): Number of slots that can be managed by a differential table (61,312)
NOTE:
Roundtheresultofthecalculationuptothenearestwholenumber.
For example, if the volume capacity (X) is the maximum OPEN-V volume capacity of
3,019,898,880 KB, the total number of differential tables is calculated as follows:
(3,019,898,880 ÷ 256) ÷ 61,312 = 192.40084
Whenyourounduptothenearestwholenumber,theresultis193.Therefore,thetotal
number of differential tables for a pair is 193 when the emulation type is OPEN-V.
1
If the selected volume is a CVS (custom volume size) volume, use the capacity of the custom volume instead of the default
volume capacity for the emulation type. Since the OPEN-L emulation type does not support custom volume operations,
you must use the default volume capacity of OPEN-L for X.
2
1KBequals1024bytes.
Table 4 Number of control cylinders according to emulation types
Emulation type
Number of control cylinders
OPEN-3
8(5,760KB
)
OPEN-8
OPEN-9
27 (19,440 KB)
OPEN-E
19 (13,680
KB)
OPEN-L 7 (5,040 KB)
OPEN-V
0(0KB)
Table 5 shows the relationship between emulation type, capacity, and differential tables. Table 6 shows
the number of differential tables used in OPEN-V.
Business Copy XP user guide
17